Alternating-current machine.



No. 835,407. PATENTED NOV. 6, 1906. M. DER ALTBRNATING CURRENT MACHINE.

APPLICATION FILED APR.12.1905.

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No. 885,407. PATENTED News, 1906.

M. DE'RI.

ALTERNATING CURRENT MACHINE.

APPLICATION FILED APR.12.1905.

3 SHEETS-SHEET 2" M'tnesses: 011/6/760/1';

' YMQX DP/Z No.- 835, 07. PATENTED NOV. 6, 1906. M. DB'RI.

ALTERNATING CURRENT MACHINE.

APPLICATION FILED APR.12.1905.

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V Fig. 5.

W iZnesses: I nven-l6or Max Dri.

" ing as in Fig. 2. Fi 4 shows diagrammat- UNIT-ED sTA Es PATENT QFFIGE.

MAX nER oE VIENNA, AUSTRIA-HUNGIABK, ASSIGNOR To STANLEY ELECTRIC MANUFACTURING COMPANY. acosromrrou or NEW JERSEY ALTERNATlNG-CUBR ENT MACHINE.

Specification of Letters Patent. Application filed A ia 12, 1906. Serial No. 265.118.

Patented Nov. e, 1906.

To all whom it may concern:

'Be it known that I, MAX Dial, a subject of the Emperor of Austria-Hungary, residing at Vienna,-.Empire of Austria-Hungary, have invented certain new and useful Improvementsin Alternating-Current Machines, of which the following is a specification.

My invention relates; to alternating cur rent dynamo-electric machines; and its object is to provide a novel arrangement of windings for such machines whereby the usual windings of the machine-and transformer-windings may .be combined conveniently and efiiciently. I

I In certain types of alternating-current motors-as, for instance, the compensated series motor -it has been proposed heretofore to supply the compensating winding from the secon ary of'a transformer the primary of which is in series with the main field and armature windings of the motor. I

ense with the use of .By my invention I dis an external transformer y lacing the transformer-windings on the field structure of the motor-in the same slots with the motor-windings and so arran jing the motor-windings and transformer-windings relatively to each other thatthe operation of the motor is not affected by the presence of the transformer windings, while the motor-current does not affect the transformer-windings. I- secure this result by arranging the motor-windings and transformer-windings with different numbers of poles, sothat the windings have no inductive effect u' on'each other.

My invention furt er consists inkcombining a motor-winding and a transformer-windwindings, so that a single set'of coils performs the functions of both. 7

Mydnvention will best be understood by reference to the accompanying drawings, in

which Figure 1 shows a motor provi ed with a motor-winding and a transformer-winding arranged non-inductively to each other in accordance with my invention. Fig. 2 shows the two'windings combined into a single set of coils. Fig. 3 shows a complete set o f mo tor and transformer windings for a com ensalted series motor, one of the motor-win in s being combined with one transformer-win ically a compensate series motor as ordiing into a single set of coils common to both narily arranged and connected; and Figs. 5 and 6 show developments on a plane surface of the wlndings of Figs. 1 and 2, respectively.

In Fig. 1, A represents the field-winding of a four-pole motor carried in slots on the inner periphery of the; field structure. For the sake of simplicity I have shown this winding as a concentrated winding. B represents a transformer-winding supported in the isame slots, but arranged as a two-pole winding. 'With such an arrangement it is evident that the windings A and B are non-inductive with respect to each other, since the inductive effect upon winding B of a north pole produced by one coil A is neutralized by an opposite effect produced by a south. pole, and similarly the efi'ect produced by winding B upon eachcoil of the motor-winding is offset by an equal and 0p osite effect produced u on a second coil. his will be clearly seen y an inspection of Fig. 5, which shows the windings of Fig. 1 developed on a plane surface, from which it will be noted at once that the resultant inductive effect of each winding on the other is zero. Consequently the effects of the currents of the two windings are mutually'undisturbed by the other, so that the same magnetic core may be. employed both for the motor-flux and for the transformerflux. Moreover, it is possible to combine the two windings into a single set of coils. For instance,if it is assumed that withthe normal full-load current flowing through the winding A-the ampere-turns are equal to 10, and if it is similarly assumed that with normal full-load current in the winding B the ampere-turns of each coil are e ual to l, the total ampere- -conductors in eac slot would be as indicated by the numerals placed opposite 'the'se veral slots in Figs. 1 and 5- -that is, if the direction of current in the conductors of the winding A,'which lie in the topmost slot in Fig. 1 and in the right-hand slot in Fig. 5, be considered at any instant as positive and the direction of current in the conductors of winding B in the same slot be similarly considered as positive, the ampere-conductors in that slot would be'equivalent to H 10 or 14. In thenext slot to-the left the sign of the current in 'the'winding A would be reversed, while that in winding B would be positive, as in the first slot.

conductors/in this slot would be 4 10 or 6.- .By tracing the corresponding. polarities of The ampere- "number from the windings A and F.

the currents in the several slots the sum of the ampere-conductors for each slot will be found to be as indicated by the numerals in Figs. 2 and 6. It will be seen from these figures that some of the slots contain ampere-conductors equal to fourteen, while others of the slots contain ampere-conductors equal to six. By providing a set of coils of two different sizes O and U with the numbers of turns bearin a ratio of fourteen'to six, placing these coi s in the proper slots, as indicated by the numerals, and connecting them in series a single winding is formed which is precisely the same in its effect as the two windings A and B of Fig. 1that is, the winding formed ofthe coils C and C will act both as a field-winding of the motor and also as a transformer-winding, and the two functions will be entirely separate from each other.

As illustrating-one case to which. my invention may be applied, reference may be had to Fig. 4. In this figure A represents the main field-winding of a series motor of the ordinary commutator type, the arm-ature being indicated by D. F represents a compensating winding arran ed to neutralize the armature reaction'an supplied from the secondary of the series transformer G, the primary of which is in series with the armature, so that the current through the compensating winding is always proportional to the armature-current. These connections represent the arrangement that has been heretofore employed.

By my invention the windings of transformer G may be placed on the field-magnet of the motor without disturbing the action ofwindings A and F simply by making the transformer-windings of a diiierent pole Also these transformenwindings may be combined with the field-windings of the motor.

For instance, if the. primary winding of transformer G is arranged as indicated by the winding B in Fig. 1 it may be combined with field-winding A so as to form a single winding of two sets ofcoils C C, as-shown in Fig. 2.

Fig. 3 .shows the field structure arranged with all these windings. The. coils G-C form a combined winding in the same manner as illustrated in Fig. 2. E represents the secondary transformer-windi which is arranged in the same slots as the winding B in Fig. 1. F represents the compensating winding, which is a four-pole winding displaced ninety electrical degrees from the main field-Winding A of Fig. 1. With this arrangement the motor operates in the same manner as though an external series transformer were employed, 'while the external transformer is'entirely dispensed with. It is evident that the windings E and F may be combined, if desired, in precisely the same manner as the windings and B of Fig. 1.

The development of winding E would be the same as shown for winding B in Fig. 5, and the development of winding F would be the same as that shown for winding A in Fig. 5, except that it would be displaced ninety electrical degrees, or, in other words, one slot in .Fi 5, since in this figure are shown only two s ots per pole. Obviously the combina tion of windings E and F could be effected in exactly the same manner as in the windings A and B simply by noting the algebraic sum of the ampere-conductors due to these windings in each slot.

' For the sake of simplicity I have shown my invention diagrammatically, with the motor-windings shown as concentrated windings. It will be understood that my invention is applicable to any well-known type of winding and to any alternating-current dynamo-electric machine in connection with which it is desired to employ a transformer. Furthermore, although I have illustrated my invention as applied to a motor, it is ob-' vious that my invention is clearly applicable to any generator with which it may be desired to employ a series transformeras, for instance, in the case ,of a selfscompounding machine.

I do not desire to limitmyselfto the particular construction and arrangement of arts here shown, but aim in the appended c aims to cover all modifications which are within the scope of my invention.

What I claim as new, and desire to secure by Letters Patent of the United States, is

1. In an alternating-current:dynamo-electric machine, in combination with the stator and the usual winding carried in the statorslots, 8. transformer-winding of a different number of poles carried in the same slots.

2. In an alternating-current dynamo-electric machine, in combination with the stator and the usual winding carried in the statorslots, a transformer-winding of a different number of poles carried in the same slots and connected'in series-With the first-mentioned winding.

3. In an alternating-current dynamo-electric machine, in combination with the stator and the usual winding carried in the statorslots, a transformerswinding of a diiferent number of poles carried in the same slots, said windings being combined into a set ofcoils common to both windings.

4. In an alternating-current motor, a slotted field structure, and .a motor-winding and a transformer-winding of difi'erentnumbers of poles carried in the same slots.

5. In an alternati -currentmotor, a slotted field structure, an amotor-win-din and a transformer-winding of difierentnum bers of poles connected in series and carried in the same slots.

6. In an alternati -current motor, aslot' ted field structure an amotor-winding and a being combined into a set of coils common to both windings.

7. In an alternating-currentdynamo-electrio machine, a slotted field structure, and

two windings of difierent pole numbers, combined into a set of coils common to both Windings, carried by said structure.

8-. In an alternating-current dynamorelectrio machine, a slotted -field structure, and a set of coils carried in the slots proportioned and arranged to correspond in respect to ampere-conductors penslot to'two windings of jdifierent-numhers of poles.

structure, said windings 9. In a compensated series motor, a slotted field structure, a main field-winding in the slots, a compensating Winding in said slots,

and primary and secondary transformerwindings of a different number of polesirom the other windings also included in said slots, one of the v transformer-windings being combined with one ofthe other windings in a set of coils common to both windings.

- In Witness whereof I have hereunto set my hand this 29th day of March, 1905.

MAX DEBT. Witnesses:

:ALVESTO S. HOGUE, AUGUST FUG ER, 

